MATH 1280 FINAL EXAM QUESTIONS AND ANSWERS
Using the value of x from the prior question, what is the SD of x? - CORRECT ANSWER✅✅1.94
What is the probably that a randomly selected item from random variable L will be greater than 0 and
less than or equal to 3? - CORRECT ANSWER✅✅.57
What is the expectation of random variable L? - CORRECT ANSWER✅✅1.60
What is the variance of random variable L? - CORRECT ANSWER✅✅14.58
Which distributions are discrete? - CORRECT ANSWER✅✅Poisson, Binomial, Uniform
What is the expected number of successes when throwing 5 darts? - CORRECT ANSWER✅✅0.75
What is the probability of getting 4 or more successes in 5 throws? - CORRECT ANSWER✅✅.00
A Poisson distribution called Q has an expectation of 4. Which of the following R commands would tell
you the probability that a randomly selected value from Q is less than 6 and greater than or equal to 4? -
CORRECT ANSWER✅✅ppois(5,4) - ppois(3,4)
At a small store, a customer enters the front door on average every 8 minutes. A prior study indicated
that the time between customers entering the front door during weekdays follows an exponential
distribution. What is the probability that the time between customers entering the store on a weekday
will be less than or equal to 7? - CORRECT ANSWER✅✅.58
You read a research paper that applies to your industry, and it says when people are given a list of facts
about your product, they are more likely to buy your product and that the different between the regular
amount of sales and the sales when people read the list of facts is 3 SDs. - CORRECT ANSWER✅✅Can
not tell because the sample size is not given.
What is the lambda value for the Poisson distribution? - CORRECT ANSWER✅✅2
Using the value of x from the prior question, what is the SD of x? - CORRECT ANSWER✅✅1.94
What is the probably that a randomly selected item from random variable L will be greater than 0 and
less than or equal to 3? - CORRECT ANSWER✅✅.57
What is the expectation of random variable L? - CORRECT ANSWER✅✅1.60
What is the variance of random variable L? - CORRECT ANSWER✅✅14.58
Which distributions are discrete? - CORRECT ANSWER✅✅Poisson, Binomial, Uniform
What is the expected number of successes when throwing 5 darts? - CORRECT ANSWER✅✅0.75
What is the probability of getting 4 or more successes in 5 throws? - CORRECT ANSWER✅✅.00
A Poisson distribution called Q has an expectation of 4. Which of the following R commands would tell
you the probability that a randomly selected value from Q is less than 6 and greater than or equal to 4? -
CORRECT ANSWER✅✅ppois(5,4) - ppois(3,4)
At a small store, a customer enters the front door on average every 8 minutes. A prior study indicated
that the time between customers entering the front door during weekdays follows an exponential
distribution. What is the probability that the time between customers entering the store on a weekday
will be less than or equal to 7? - CORRECT ANSWER✅✅.58
You read a research paper that applies to your industry, and it says when people are given a list of facts
about your product, they are more likely to buy your product and that the different between the regular
amount of sales and the sales when people read the list of facts is 3 SDs. - CORRECT ANSWER✅✅Can
not tell because the sample size is not given.
What is the lambda value for the Poisson distribution? - CORRECT ANSWER✅✅2
